Battery state detection device and battery protection device

Abstract

An apparatus for detecting battery state may comprise a first fuse connected to a positive terminal of a battery; a second fuse connected to a negative terminal of the battery; a high resistance resistor connected to the first fuse and the second fuse and disposed in parallel with the battery; a sensor for measuring a current flowing through the high-resistance resistor or a voltage applied to the high-resistance resistor; and a controller for determining a system voltage and determine whether any of the fuses is blown based on the current measured or the voltage measured.

1 . An apparatus for detecting a battery state comprising:
 a first fuse connected to a positive terminal of a battery;   a second fuse connected to a negative terminal of the battery;   a high resistance resistor connected to the first fuse and the second fuse and disposed in parallel with the battery;   a sensor configured to measure a current flowing through the high-resistance resistor or a voltage applied to the high-resistance resistor; and   a controller configured to determine a system voltage and determine whether any of the first and second fuses is blown based on the current measured or the voltage measured.   
     
     
         2 . The apparatus for detecting the battery state of  claim 1 , wherein the sensor is a current sensor positioned between the high resistance resistor and the first fuse and connected in series with the high resistance resistor or positioned between the high resistance resistor and the second fuse and connected in series with the high resistance resistor. 
     
     
         3 . The apparatus for detecting the battery state of  claim 1 , wherein the sensor is a voltage sensor connected in parallel with the high resistance resistor to measure the voltage applied to the high resistance resistor. 
     
     
         4 . The apparatus for detecting the battery state of  claim 1 , wherein the controller is included in a battery management system (BMS) that manages a battery state. 
     
     
         5 . The apparatus for detecting the battery state of  claim 2 , wherein the controller is configured to determine that at least one of the first fuse and the second fuse is blown when the current value measured by the current sensor is zero. 
     
     
         6 . The apparatus for detecting the battery state of  claim 2 , wherein the controller is configured to calculate a system voltage provided by the battery using the current value measured by the current sensor and the resistance value of the high resistance resistor. 
     
     
         7 . The apparatus for detecting the battery state of  claim 3 , wherein the controller is configured to determine that the fuse is blown when the voltage value measured by the voltage sensor is zero. 
     
     
         8 . The apparatus for detecting the battery state of  claim 3 , wherein the controller is configured to determine the voltage measured by the voltage sensor as a system voltage provided by the battery. 
     
     
         9 . A battery protection apparatus in an energy storage system including a battery and a power conversion system, the battery protection apparatus comprising:
 a first fuse connected to a positive terminal of a battery;   a second fuse connected to a negative terminal of the battery;   a first main contactor configured to control a connection between the first fuse and the power conversion system;   a second main contactor configured to control a connection between the second fuse and the power conversion system;   a high resistance resistor connected to the first fuse and the second fuse and disposed in parallel with the battery;   a sensor configured to measure a current flowing through the high-resistance resistor or a voltage applied to the high-resistance resistor; and   a controller configured to determine a system voltage and determine whether any of the first and second fuses is blown from the measured current or measured voltage.   
     
     
         10 . The battery protection apparatus of  claim 9 , wherein the sensor is a current sensor positioned between the high resistance resistor and the first fuse and connected in series with the high resistance resistor or positioned between the high resistance resistor and the second fuse and connected in series with the high resistance resistor. 
     
     
         11 . The battery protection apparatus of  claim 9 , wherein the sensor is a voltage sensor connected in parallel with the high resistance resistor to measure a voltage applied to the high resistance resistor.